In January 2015, Jerry Jones explained that roster turnover every year is about 30%:
”We have about a 30 percent turnover every year. What is the core? Who is the core? That’s a part of what we’ll be doing. We’ve had more numbers of players play a key role in our success this year than I had thought we would when we started this season.”
So it shouldn’t come as much of a surprise to find that the 2018 Cowboys will look quite a bit different from last year’s iteration of the team.